I guesstimated using the 66 years WolframAlpha spat out, while Google (sourcing World Bank) has 81.5 years (2012) with a more or less steady increase. Let's jus

I guesstimated using the 66 years WolframAlpha spat out, while Google (sourcing World Bank) has 81.5 years (2012) with a more or less steady increase. Let's just say WA was smart enough to factor all that in. Edit: Google data is for UK, because currency used in parent.